Clear Glass Window

I have to make 'shower cubicle' cake and wondered if anyone had any idea how to create clear glass? I thought about gelatine sheets but I don't think it will be rigid enough, I also considered Isomalt but that seems to appear bubbly/opaque and I need it to be clear...any ideas appreciated.

Bleh! I read too fast and should have done a brain/ fingertip connection. Sorry. If you don't need it to be edible, Lowes has a very thin plexiglass! You can use a razor box cutter or they will make cuts for you.